... constant. 2,Power Efficiency ≥85%,Power Factor≥0.9, THD≤20%. 3,Intelligent power supply design,avoiding electric current's direct ... the eye fatigue.9, No filament or glass shell, won't be broken as traditional tubes.10,High CRI,good colour ... (K):2500K – 6800KCRI(Ra):Ø 75Lifespan(H):≥40000Working Temp(°C):-25°C - 50°CStorage Temp(°C) :-40°C - 80°COperating Humidity:≥10%,≤90%Material: Aluminum+PC